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Prepositions with nouns

“Of department” or “in department”?

“In the department” is a common expression for membership or location within an organisation. “Of department” is usually incomplete unless another noun comes before it, such as “head of department”.

Quick answer

Which form is correct?

Use “in the department” to talk about working, studying, or being located within a department. “Of department” is generally not used by itself in standard English. However, “of the department” can appear after another noun, such as “director of the department” or “member of the department.”

She works in the department of chemistry.
He is the head of the department.
Several researchers in the department joined the project.

Choose the pattern by meaning

These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.

1
in the department

Talking about membership or location

Use this pattern when someone works, studies, or is physically located within a department.

I met several colleagues in the department yesterday.
She has worked in the department for five years.
2
of the department

Showing relationship after another noun

This pattern usually follows a noun that identifies a role, member, part, or feature connected to the department.

He became director of the department in 2022.
The budget of the department was reduced.
3
department of + subject

Naming an academic or organisational unit

Use this structure to name a department by its subject or function.

She teaches in the Department of History.
The Department of Finance released a report.

See the difference in context

The same subject can take different constructions because each sentence answers a different question.

Construction
Example
Meaning
in the department
She works in the department of biology.
Correct for someone working or being located within a department.
of the department
He is a senior member of the department.
Correct after another noun to show connection with the department.
of department
Incorrect: She works of department.
Nonstandard and incomplete in modern English.
department of + field
The Department of Physics is on the second floor.
Used in official department names.

Common mistakes

Some combinations appear in real text but do not mean what learners often assume.

Using “of department” without an article or main noun

English normally requires a fuller structure such as “of the department” after another noun.

✕ She is of department. ✓ She is part of the department.

Using “in department” without an article

Singular countable nouns like “department” usually need an article.

✕ He works in department. ✓ He works in the department.

Confusing location with possession

Use “in the department” for location or membership, not “of the department.”

✕ They study of the department. ✓ They study in the department.

Quick practice

Choose the expression that matches the intended meaning.

1. She has worked ___ the department since May.
2. He is the head ___ the department.
3. The ___ Chemistry organised the conference.

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Frequently asked questions

Is “of department” ever correct?

Not usually by itself. English normally uses “of the department” after another noun, such as “manager of the department.”

Why do we say “in the department”?

The preposition “in” shows location, membership, or involvement within a department.

Can I say “department of sales”?

Yes. “Department of + field or function” is a standard way to name departments, especially in formal contexts.

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